Abstract: An electromagnetic micro actuator, e.g. for use in fiber optics, is operated by a ferromagnetic piston mounted within two electromagnetic coils inside a housing. The piston is held in place and magnetized by a plurality of permanent magnets. The coils are wired for opposite polarity and energizing the coils will tend to push the piston away from one coil and draw it towards another. A ceramic shaft attached to the piston protrudes from both ends of the micro actuator housing and moves with said piston. Energizing the coils thus moves the piston in one or the opposite direction depending on the current direction. Tapered jewel bearings guide the shaft with minimal friction.

Abstract: The stator of the motor comprises two pole pieces (1, 2) which are axially staggered. An axially magnetized cylindrical rotor (5) is disposed in the openings or bores of said pole pieces. The rotor (5) is provided with an external toothing (3) which is continuously engaged with an internal toothing (4) of the stator. In the unexcited stator, the rotor (5) assumes a stable position by attraction to the pole pieces (1, 2). Due to the excitation of the stator by a pulse having a suitable polarity, the rotor is displaced to a diametrically opposed stable position. The toothings (3, 4) stay in engagement during said displacement, resulting in an angular displacement of the rotor, the angle being defined by the difference of the number of teeth of said toothings (3, 4). The motor allows a miniaturization and a simple control by alternating pulses of opposed polarities.

Abstract: The proposed device is an identification system having an interrogator/receiver and a passive transponder. The interrogator/receiver includes a clock signal generator (1) a group of bandpass filters (5), a section to decode the data received, and an interrogator coil (4) for inductively coupling the interrogator/receiver to the transponder. The transponder includes a section (E) for picking up the power signal transmitted by the interrogator/receiver, a section (F) to codify the signal obtained according to a predetermined code stored in a memory (15), and a section (G) for phase modulating the codified data so as to allow air transmission. Particularly, the bandpass filters (5) are capable of detecting a frequency band width lower than one thousandth of the signal's frequency.